Battery prices just crashed harder than anyone expected. The cost of lithium-ion packs has fallen by 20% in a single year. That's the steepest drop on record. We're now looking at 15 per kilowatt-hour. Two years ago, that figure was 50. For an electric car with a 60 kWh battery, that's a saving of over ,000. Why? A massive global oversupply. China is flooding the market with cheap cells. Mining companies dug up too much lithium. Demand didn't keep up. This changes everything. Electric cars can finally compete with gas guzzlers on price. Home battery systems become affordable. The clean energy transition just got a serious boost. But there's a catch. Miners are hurting. Some are slashing production. Prices could bounce back. For now though, cheap batteries are here. And they're rewriting the rules of the energy game.